:root {
  --bg-base: #f4f7fb;
  --bg-accent: #e6f2ff;
  --surface: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --accent: #0ea5e9;
  --accent-strong: #0284c7;
  --accent-2: #22c55e;
  --accent-2-strong: #16a34a;
  --border: rgba(15, 23, 42, 0.12);
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
  --shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --radius-sm: 12px;
  --font-body: "Noto Sans", "PT Sans", sans-serif;
  --font-display: "PT Sans", "Noto Sans", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: radial-gradient(1200px 600px at 15% -10%, var(--bg-accent), transparent 70%),
    radial-gradient(900px 500px at 95% 0%, #eaf7ff, transparent 65%),
    linear-gradient(180deg, var(--bg-base), #f8fafc 30%, #f6f7fb 100%);
  line-height: 1.7;
  margin: 0;
  padding-top: 0;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(transparent 24px, rgba(15, 23, 42, 0.035) 25px),
    linear-gradient(90deg, transparent 24px, rgba(15, 23, 42, 0.035) 25px);
  background-size: 25px 25px;
  opacity: 0.35;
  pointer-events: none;
  z-index: -1;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.container {
  max-width: 1220px;
  width: 100%;
  padding-left: 24px;
  padding-right: 24px;
  margin-left: auto;
  margin-right: auto;
}

.row {
  margin-left: 0;
  margin-right: 0;
}

.nav,
.navbar-nav,
.list-inline {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.list-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.col-md-12,
.col-md-11,
.col-md-8,
.col-md-4 {
  width: 100%;
}

.col-md-11 {
  max-width: 100%;
}

/* Navigation */
.navbar.navbar-default.navbar-fixed-top {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  margin: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(12px);
  padding: 8px 0;
  z-index: 1000;
}

.navbar.navbar-default.navbar-fixed-top .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.navbar-default .navbar-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.5px;
  background: linear-gradient(120deg, var(--accent-2), var(--accent), var(--accent-2-strong));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.navbar-default .navbar-brand i {
  margin-right: 8px;
}

.navbar-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
}

.navbar-right {
  margin-left: auto;
}

.navbar-nav > li {
  margin: 0;
  border-top: none;
}

.navbar-default .navbar-nav > li > a {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 12px;
  text-transform: uppercase;
  padding: 10px 14px;
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.navbar-default .navbar-nav > li > a:hover,
.navbar-default .navbar-nav > li > a:focus {
  color: var(--accent-strong);
  background-color: rgba(14, 165, 233, 0.12);
  text-decoration: none;
  transform: translateY(-1px);
}

.navbar-toggle {
  border-radius: 999px;
  border: 1px solid var(--border);
  margin-top: 8px;
  background: #ffffff;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  min-height: 40px;
  min-width: 44px;
  line-height: 0;
}

.navbar-toggle .icon-bar {
  background-color: var(--ink);
  width: 22px;
  height: 2px;
  border-radius: 999px;
  display: block;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.navbar-collapse {
  border-top: none;
  display: flex;
  justify-content: flex-end;
  flex: 1 1 auto;
}

/* Layout */
#content-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  padding: 24px 0 10px;
}

#content-main > .col-md-8,
#content-main > .col-md-4 {
  width: 100%;
  padding: 0;
}

.col-md-offset-1 {
  margin-left: 0;
}

/* Cards */
.content-card,
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.content-card {
  border-top: 4px solid rgba(14, 165, 233, 0.5);
  padding: 38px 44px;
}

.content-card--summary {
  margin-bottom: 24px;
}

.card {
  border-top: 3px solid rgba(14, 165, 233, 0.45);
  padding: 20px 24px;
}

.card h5,
.content-card h5 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.content-card:hover,
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.content-card h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.4rem + 2vw, 3.1rem);
  margin: 0 0 18px;
  line-height: 1.1;
}

.content-card h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 1.1rem + 1vw, 2.2rem);
  margin-top: 28px;
}

.content-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-top: 22px;
}

.content-card .meta {
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.content-card .meta li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.content-card .meta a {
  color: inherit;
}

.content-card img {
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.12);
}

.content-card blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 18px;
  margin: 24px 0;
  background: rgba(14, 165, 233, 0.08);
  border-radius: var(--radius-sm);
  color: var(--muted);
}

.content-card .share {
  margin: 16px 0 0;
  padding: 0;
}

.content-card .share li {
  margin: 0;
}

.content-card .share a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: rgba(15, 23, 42, 0.08);
  color: var(--ink);
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 999px;
  letter-spacing: 0.03em;
  font-size: 12px;
}

.content-card .share .share-icon {
  width: 18px;
  height: 18px;
  display: inline-block;
  background-color: currentColor;
  mask: url("/img/bluesky.svg") no-repeat center / contain;
  -webkit-mask: url("/img/bluesky.svg") no-repeat center / contain;
}

.content-card .share a:hover {
  background: rgba(14, 165, 233, 0.15);
  color: var(--accent-strong);
  text-decoration: none;
}

.content-card .tags a {
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-2-strong);
  border-radius: 999px;
  padding: 4px 12px;
}

.content-card .tags a:hover {
  background: rgba(34, 197, 94, 0.25);
  text-decoration: none;
}

.posts-recent li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.posts-recent li a {
  color: var(--ink);
}

.posts-recent li a:hover {
  color: var(--accent-strong);
  text-decoration: none;
}

.comment-disclaim {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

#comments #disqus_thread_click {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#comments {
  margin-top: 22px;
}

.col-md-4 .row + .row {
  margin-top: 18px;
}

.terms-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 12px;
}

.terms-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
}

.terms-list a {
  color: var(--ink);
  font-weight: 600;
}

.terms-list a:hover {
  color: var(--accent-strong);
  text-decoration: none;
}

.terms-list .term-count {
  font-size: 0.85rem;
  color: var(--muted);
  background: rgba(15, 23, 42, 0.08);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.btn,
.btn-custom,
.btn-default {
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 10px 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.btn-custom {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  border: none;
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.25);
}

.btn-custom:hover,
.btn-custom:focus {
  transform: translateY(-1px);
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent-2-strong), var(--accent-strong));
}

.btn-default {
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--ink);
}

.btn-default:hover,
.btn-default:focus {
  background: #f0f9ff;
  border-color: rgba(14, 165, 233, 0.4);
}

.form-control {
  border-radius: 999px;
  border: 1px solid var(--border);
  height: 42px;
  padding: 8px 14px;
  box-shadow: none;
}

.form-control:focus {
  border-color: rgba(14, 165, 233, 0.55);
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12);
}

.input-group-btn > .btn {
  padding: 10px 16px;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.input-group .form-control {
  flex: 1 1 auto;
}

.input-group-btn {
  display: flex;
}

code {
  background: rgba(15, 23, 42, 0.08);
  color: #0f766e;
  border-radius: 8px;
  padding: 2px 6px;
}

pre {
  border-radius: var(--radius-sm);
  padding: 16px;
  background-color: #0f172a;
}

pre code {
  background: transparent;
  color: #e2e8f0;
}

footer {
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.08), rgba(34, 197, 94, 0.08));
  border-top: 1px solid var(--border);
  padding: 30px 0 10px;
  margin-top: 40px;
}

footer a {
  color: var(--ink);
}

footer a:hover {
  color: var(--accent-strong);
}

/* Animation */
@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#content-main .row {
  animation: card-in 0.7s ease both;
}

#content-main .row:nth-child(1) { animation-delay: 0.04s; }
#content-main .row:nth-child(2) { animation-delay: 0.08s; }
#content-main .row:nth-child(3) { animation-delay: 0.12s; }
#content-main .row:nth-child(4) { animation-delay: 0.16s; }
#content-main .row:nth-child(5) { animation-delay: 0.2s; }

.col-md-4 .row:nth-child(1) { animation-delay: 0.06s; }
.col-md-4 .row:nth-child(2) { animation-delay: 0.12s; }
.col-md-4 .row:nth-child(3) { animation-delay: 0.18s; }
.col-md-4 .row:nth-child(4) { animation-delay: 0.24s; }

#back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 50;
}

#back-to-top .back-to-top-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  color: var(--ink);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow-soft);
  font-weight: 600;
}

#back-to-top .back-to-top-link:hover {
  color: var(--accent-strong);
  text-decoration: none;
  transform: translateY(-1px);
}

#back-to-top .back-to-top-link i {
  font-size: 14px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  #content-main .row {
    animation: none;
  }
  .content-card,
  .card,
  .btn-custom,
  .btn-default,
  .navbar-default .navbar-nav > li > a {
    transition: none;
  }
}

@media (max-width: 1100px) {
  #content-main {
    grid-template-columns: minmax(0, 1fr) 280px;
  }
}

@media (max-width: 991px) {
  body {
    padding-top: 0;
  }

  #content-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding-top: 12px;
  }

  .navbar-toggle {
    display: inline-flex;
    margin-top: 0;
  }

  .navbar-header {
    width: 100%;
    justify-content: space-between;
    flex-direction: row-reverse;
  }

  .navbar-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 10px 0;
    width: 100%;
  }

  .navbar-collapse {
    display: none;
    background: #ffffff;
    border-radius: var(--radius);
    margin-top: 12px;
    box-shadow: var(--shadow-soft);
    padding: 8px 14px;
    width: 100%;
  }

  .navbar-collapse.is-open {
    display: block;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 17px;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .content-card {
    padding: 26px 20px;
  }
}